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EUA2510A Schematic ( PDF Datasheet ) - Eutech Microelectronics

Teilenummer EUA2510A
Beschreibung Low EMI 2.7W Boosted Class-D Audio Power Amplifier
Hersteller Eutech Microelectronics
Logo Eutech Microelectronics Logo 




Gesamt 14 Seiten
EUA2510A Datasheet, Funktion
EUA2510A
Low EMI 2.7W Boosted Class-D
Audio Power Amplifier
DESCRIPTION
The EUA2510A integrates a current-mode boost converter
with a high efficiency mono, Class D audio power amplifier
to provide 2.7W/10% THD or 2W/1% THD continuous
power into a 4speaker when operating on a 3.3V power
supply with boost voltage (PV1) of 5V. The Class D
amplifier is a low noise, filterless PWM architecture that
eliminates the output filter, reducing external component
count, board area consumption, system cost, and simplifying
design.
The EUA2510A’s boost converter, operating at a fixed
frequency of 600KHz, generates a high voltage rail which is
used to supply the Class-D amplifier. The EUA2510A
features a low-power consumption shutdown mode.
Shutdown may be enabled by driving the Shutdown pin to a
logic low (GND).
The gain of the Class D is externally configurable which
allows independent gain control from multiple sources by
summing the signals. Output short circuit and Thermal
shutdown protection prevent the device from damage during
fault conditions. Superior click and pop suppression
eliminates audible transients during power-up and shutdown.
FEATURES
z 2.7W/10% THD into a 4Load with a 3.3V Supply
z Fully Differential Inputs
z Externally Configurable Gain on Class D
z 2.7V - 5V operation (VDD)
z Independent Boost and Amplifier Shutdown Pins
z 0.5µA Shutdown Current
z Integrated Pop and Click Suppression Circuitry
z 3mm × 4mm TDFN-14 Package
z RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
z Mobile Phones
z GPS
z Portable Media
z Handheld Games
Typical Application Circuit
DS2510A Ver1.0 Apr. 2010
Figure1.
1






EUA2510A Datasheet, Funktion
EUA2510ATel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Typical Operating Characteristics
Figure2.
Figure4.
Figure3.
Figure5.
Figure6.
DS2510A Ver1.0 Apr. 2010
Figure7.
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EUA2510A pdf, datenblatt
EUA2510ATel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
VDIODE = Schottky diode forward voltage, typically,
0.6V
FS = switching frequency, 600KHz.
I = IOUT
L - AVG 1 D
D = MOSFET turn-on ratio:
D =1
V
IN
VOUT + VDIODE
Class D Requirements
Figure 27 shows the class-D typical schematic with
differential inputs and Figure 28 shows the class-D with
differential inputs and input capacitors, and Figure 29
shows the class-D with single-ended inputs. Differential
inputs should be used whenever possible because the
single-ended inputs are much more susceptible to noise.
Table 1. Typical Component Values
REF DES
RI
CS
CI (1)
VALUE
150k( ± 0.5%)
1µF (+22%,-80%)
3.3nF ( ± 10%)
(1) CI is only needed for single-ended input or if VICM is not
between 0.5 V and VDD – 0.8 V. CI = 3.3 nF (with RI = 150
k) gives a high-pass corner frequency of 321 Hz.
Figure 28. Typical Application Schematic With
Differential Input and Input Capacitors
Figure 29. Typical Application Schematic With
Single-Ended Input
Input Resistors (RI)
The input resistors (RI) set the gain of the amplifier
according to equation (1).
Figure 27. Typical Application Schematic With
Differential Input for a Wireless Phone
DS2510A Ver1.0 Apr. 2010
Gain = 2 × 150k V  ---------------------------------(1)
RI V
Resistor matching is very important in fully differential
amplifiers. The balance of the output on the reference
voltage depends on matched ratios of the resistors. CMRR,
PSRR, and cancellation of the second harmonic distortion
diminish if resistor mismatch occurs. Therefore, it is
recommended to use 1% tolerance resistors or better to
keep the performance optimized. Matching is more
important than overall tolerance. Resistor arrays with 1%
matching can be used with a tolerance greater than 1%.
Place the input resistors very close to the class-D to limit
noise injection on the high-impedance nodes.
For optimal performance the gain should be set to 2 V/V
or lower. Lower gain allows the class-D to operate at its
best, and keeps a high voltage at the input making the
inputs less susceptible to noise.
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